Unitary cylinder reconditioning tool



Dec. ,8,194 E. D. GREEN 2,304,405

UNITARY CYLINDER RECONDITIONING TOOL 7 Filed Spt. 21, 1940 VINVENTOR, suor p. GREEN.

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Patented Dec. 8, 1942 UNITARY CYLINDER RECONDITIONING TOOL Eliot D. lreen, San Francisco, Calif. Application- September 21, 1940, SerialNo. 357,705

lClaims.

My invention relates to tools for reconditioning engine cylinders which have become worn through use,,and more particularly to'a tool for removing ridges formedby piston wear from the topof engine cylinders.

My present invention is an improvementon my prior Patent No. 1,993,004 issued March 5, 1935. 1

In my patent above referred to, I described and claimed-a cylinder reconditioning tool which was adapted to be mounted on a piston in place within an engine cylinder to be reconditioned.

My prior tool was also adaptedtobe driven by a separate source of power, such as an electric drill.

The present invention utilizes the same cylinder and guide assembly as was used in my prior patented device but is adapted to rest, not on the piston, but on the-top of the engine cylinder, is

driven by a motor which is an integral part of the device.

Among the objects of my invention are to provide a cylinder reconditioning tool having a ridge cutting wheel operated at-relatively low rotational speeds; to provide a ridge cutting tool whichis adapted to rest on the top of a cylinder to be reconditioned, and whichis adjustable with respect -to said top; to provide a unitary ridge cutting tool and motor; to providea ridge cutting tool which is adjustable, both. longitudinally of the engine cylinderaxis and at right angles thereto, andto providea. single, efficient, ridge cutting tool for use on engine cylinders.

In the. drawing:

Fig. 1 is a longitudinal view partly in section and partly in elevation of one preferred form of ridge cutting tool of my invention, in position on the top of an engine cylinder to be reconditioned.

Fig. 2 is a diagrammatic 'bottom view ofthe cutting wheel and guide showing their relation to the cylinder wall.

Fig. 3 is a view partly in section and partly in elevation, taken as indicated by the line 3-3 in Fig. 1.

Fig. 4 is a view similar to Fig. 3 taken as indicated by the lined-4 in Fig. 1.

Other objects of my invention will be apparent or will be specifically pointed out in the description forming a part of this specification, but I do not limit myself to the embodiment of the invention herein described, as various forms may be adopted within the scope of the claims.

My invention may be more fully understood by direct reference to the drawing. An engine cylinder I having a ridge 2 on the inner surface .M on bearings ll.

thereof, caused by wear of the piston within the cylinder, has positioned on the top surface 3 thereof, a base plate "4. This base plate may be in two separate parts, namely, a disc 5 to which is attached a cup portion 6 having a concavity 1 opening toward the inside of'cylinder I. In many cases, when small cylinders are to be reconditioned, cup 6 only need be used, as the diameter of the cup 6 maybe sufficient to bridge the open top of the cylinder. 'In case large cylinders are to be reconditioned, disc 5 may be added so thatthe top of the larger cylinders may be bridged. Obviously, if deemed desirable, discs 5 of various size may be employed for different size cylinders.

The top of cup Bis provided with an annular shoulder 8 extending parallel to the axis of the cylinder, and in this shoulderisslidably mounted an outer sleeve 9. This outer sleeve 9 is maintained in vertical position, i. e., when the cylinder I is in vertical position, by an outer sleeve adjustment screw 10 bearing against an outer adjustment block .I. I, which in turn bears against outer sleeve .9. Outer sleeve 9 is provided with a concentric bore in which is mounted an inner sleeve l2. Outer sleeve 9 is prevented from rotatingin shoulder 8 by key l3. Inner sleeve [2 is provided with an eccentric shaft vbore l4 and an upper, laterally extending motor platform i5. A drive shaft 16 ismounted within shaft bore At the cylinder end of shaft I6 is mounted a ridge cutting wheel I8 held onto shaft 16 between nut l9 and shaft shoulder 20. Cutting wheel l8 extends laterally across the lower inner sleeve 12 and over a portion of the end of the outer sleeve 9 and in contact therewith, thus alining, as far as the lower portion of the tool is concerned, the inner and outer sleeves. The extreme lower portion of outer sleeve 9 is provided with a wheel shield 2i terminating in cylinder wall engaging guides 22 below the level of the lower surface of cutting wheel 3, for

purposes set forth in my above cited patent, and

to be briefly mentioned herein later.

The motor platform l5; as it extends laterally, abuts the up'perend of outer sleeve 9 so that when cutting. wheel I8 is in place, inner and outer sleeves are held in fixed longitudinal relationship. Inner sleeve l2, however, may rotate within the outer sleeve, and rotational relationship of the inner and outer sleeves is under the control of an inner sleeve lock screw 23 threaded through outer sleeve 9 and bearing against inner sleeve block 24. Thus, both inner and outer sleeves may be adjusted vertically in which the tool assembly rests.

shoulder 8 and locked by screw It, and the inner sleeve may be rotated in the outer sleeve and locked by screw 23.

Mounted on the outer edges of motor platform 55 is a motor case 25 containing a motor (not shown) energized by power leads 26. and having a central shaft 21 on which is mounted a drive gear 28. The upper end of shaft I6 is provided with a main gear 29, and main gear 29 is driven from motor gear 27 by double idler gear 3t, to give a rotational speed to shaft IS, reduced below the rotational speed of the motor. Thus the tool when assembled is a complete unit and needs only to have power leads 28 connected to a convenient source of power to place the tool in operation.

In use, the cylinder head of the engine to be reconditioned is removed and the tool placed with the disc 5 or the cup 6 resting on the flat cylinder top. Outer sleeve adjustment screw it is loosened and the both sleeves are dropped until wheel i8 is below the ridge 2 to be removed, and then the screw It is temporarily tightened. Inner sleeve adjustment screw 23 is then loosened and inner sleeve 62 only is rotated :until the guides 22 and the teeth of the cutting wheel E8 are all three in contact with the cylinder wall. The adjustment screw 23 is then tightened, thus locking the inner to the outer sleeve. Due to the eccentric relationship of the inner sleeve and cutter shaft this, rotation of the inner sleeve moves the cutting wheel inwardly or outwardly with respect to guides 22 and sets the cutting wheel with respect to the guides for normal cylinder wall curvature. Outer sleeve adjustment screw it is then again loosened and the entire sleeve assembly is raised until the cutting wheel alone is opposed to the ridge, with the guide terminals 22 below the ridge. .The motor is then started to rotate shaft l6 and pressure on the tool toward the ridges forces the cutter against the ridge, causing the cutting wheel to remove the ridge. As cutting progresses, the guides 22, being below the ridge will contact the cylinder wall and prevent further cutting when the ridge is removed. After the tool has been operated all around the periphery of the wall the ridge is completely removed, the surface remaining being an exact extension of the cylinder wall on which the piston reciprocates, and having the same curvature. Thus, with my present invention I am able to out'ridges away from cylinders which do not have pistons therein upon which to rest the cutter. I have also provided a device which is fully adjustable with respect to the top of the cylinder upon The use of removable discs 5 allows me to use a disc which will bridge the cylinder openings and yet which can be kept sufficiently small to operate within cylinder head studs, which many times project from the top of a cylinder block. The use of the cup 6 allows the inner and outer sleeve assembly, together with the cutting wheel, to be moved upwardly so that the wheel l8 may have its lower edge at least level with the top of the cylinder. It should also be pointed out that the unitary structure of my present invention allows a relativelysmall driving motor to be used with speed reduction gears, so that the cutting wheel rotates at a relatively low speed. This low speed of rotation, far below that of the ordinary electric drills used on my prior device, allows the use of relatively low speed cutting steel in wheel 18, whereas if the cutting wheel is driven at high speed, special hardened steels must be used in the cutting wheel at a considerably greater expense. Thus, the present device is not only self contained as to motor power, but can make use of inexpensive cutting steels, as such steels easily cut cast iron when rotated at low speeds.

My structure also allows the use of high speed grinding wheels in place of cutting wheel l8 with a 1:1 gear connection of the motor shaft and cutting wheel shaftto give high speed rotation thereof. Such high speed grinding wheels are ideal for removing ridges from hardened cyl-. inder sleeves such as, for example those used in Diesel engines.

I claim: I A

1. In a cylinder reconditioning tool having a motor driving a ridge-cutting wheel, the improvement comprising a base plate adapted to span the open end of a cylinder and rest thereon, an outer sleeve mounted in an aperture in said base plate and slidably adjustable with respect thereto, means for preventing rotation of said outer sleeve on said base plate, an inner sleeve mounted in a concentric bore in said outer sleeve, and rotatably adjustable with respect to said latter, a shaft extending eccentrically through said inner sleeve and mounted thereon said ridge cutting wheel being mounted on one end of said shaft and extending laterally over the end of said inner sleeve, said driving motor being connected with the other end of said shaft.

2. Apparatus in accordance with claim 1 wherein said base plate is concave facing said cylinder to permit the'positioning of said wheel above the level of the open end of said cylinder.

3. Apparatus in accordance with claim 1 wherein said ridge cutting wheel extends laterally across the ends of both inner and outer sleeves and in contact therewith, and wherein the opposite end of said ,inner sleeve is extended laterally beyond the end of. said outer sleeve to retain said outer sleeve on said inner sleeve.

4. Apparatus in accordance with claim 1 wherer in said ridge cutting wheel extends laterally across the ends of both inner and outer sleeves and in contact therewith, and wherein the opposite end of said inner sleeve is extended laterally beyond the end of said outer sleeve to retain said outer sleeve on said inner sleeve and wherein said motor is fixedly mounted on the lateral extension of said inner sleeve.

ELIOT D. GREEN. 

